Re: [OSM-talk] OT - Unusual Bing imagery
Mike N wrote on 19/07/2012 at 12:43:19 +1100 subject [OSM-talk] OT - Unusual Bing imagery : I spotted this today as I was entering survey information: http://greenvilleopenmap.info/Airplane.jpg I didn't realize that the Bing planes flew so high. If you give the location of this image, it would be possible to look for its shadow and calculate an approximate altitude. The Bing imagerie could be satellite imagerie, not necessarily air plane imagerie. -- Sincerely Hendrik Oesterlin - New Caledonia ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
On 24 July 2012 00:52, Hendrik Oesterlin hendrikmail2...@yahoo.de wrote: http://greenvilleopenmap.info/Airplane.jpg If you give the location of this image, it would be possible to look for its shadow and calculate an approximate altitude. The Bing imagerie could be satellite imagerie, not necessarily air plane imagerie. The area in the screenshot seems to have a higher resolution than satellites can achieve. Also I've stumbled on big airliners in Yahoo or Bing satellite imagery before and they look much different (longer exposition time and the RGB components somehow have an offset because of the altitude difference, like here: http://www.streetviewfun.com/2010/airplane-on-satellite-image-2/) Cheers ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
At 2012-07-23 16:02, andrzej zaborowski wrote: On 24 July 2012 00:52, Hendrik Oesterlin hendrikmail2...@yahoo.de wrote: http://greenvilleopenmap.info/Airplane.jpg Nice catch, Mike N. Finding a plane in flagrante used to be quite an achievement in the KHBBS days :) The Bing imagerie could be satellite imagerie, not necessarily air plane imagerie. The area in the screenshot seems to have a higher resolution than satellites can achieve. Is this documented somewhere? Assuming from the look and ratio of measurements of the jet that it is a B737, the pic is at z20 (~12cm/pel @ middle lats). I was under the impression that all of the Bing/Yahoo/Google imagery was still satellite-based, down to z21 (6cm/pel). I know Google has spots of UHR imagery at z22, but it seems they were still referred to as satellite. I've seen individual county websites with very nice imagery described as flyover, as though coming from airplane/helicopter, apparently on a contract basis. -- Alan Mintz alan_mintz+...@earthlink.net ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
On 24 July 2012 03:48, Alan Mintz alan_mintz+...@earthlink.net wrote: At 2012-07-23 16:02, andrzej zaborowski wrote: The area in the screenshot seems to have a higher resolution than satellites can achieve. Is this documented somewhere? Assuming from the look and ratio of measurements of the jet that it is a B737, the pic is at z20 (~12cm/pel @ middle lats). I was under the impression that all of the Bing/Yahoo/Google imagery was still satellite-based, down to z21 (6cm/pel). I know Google has spots of UHR imagery at z22, but it seems they were still referred to as satellite. I've seen individual county websites with very nice imagery described as flyover, as though coming from airplane/helicopter, apparently on a contract basis. I've assumed 0.5m/px is the technical limit for satellite imaging, Wikipedia seems to confirm this more or less: The latest commercial satellite (GeoEye 1) has a GSD of 0.41 m (effectively 0.5 m due to United States Government restrictions on civilian imaging).[1] I guess military satellites might have better parameters, but anything you're likely to see on the web with a higher resolution will be taken from within the troposphere. I've been told once that 0.5m is the usual limit around the world except Israel of which you're unlikely to see imagery better than 2m due to the government's threats. Cheers ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
From: andrzej zaborowski [mailto:balr...@gmail.com] Subject: Re: [OSM-talk] OT - Unusual Bing imagery On 24 July 2012 03:48, Alan Mintz alan_mintz+...@earthlink.net wrote: At 2012-07-23 16:02, andrzej zaborowski wrote: The area in the screenshot seems to have a higher resolution than satellites can achieve. Is this documented somewhere? Assuming from the look and ratio of measurements of the jet that it is a B737, the pic is at z20 (~12cm/pel @ middle lats). I was under the impression that all of the Bing/Yahoo/Google imagery was still satellite-based, down to z21 (6cm/pel). I know Google has spots of UHR imagery at z22, but it seems they were still referred to as satellite. I've seen individual county websites with very nice imagery described as flyover, as though coming from airplane/helicopter, apparently on a contract basis. I've assumed 0.5m/px is the technical limit for satellite imaging, Wikipedia seems to confirm this more or less: The latest commercial satellite (GeoEye 1) has a GSD of 0.41 m (effectively 0.5 m due to United States Government restrictions on civilian imaging).[1] I guess military satellites might have better parameters, but anything you're likely to see on the web with a higher resolution will be taken from within the troposphere. I've been told once that 0.5m is the usual limit around the world except Israel of which you're unlikely to see imagery better than 2m due to the government's threats. This matches up with what I've heard in discussions with one of the cities about their imagery. Another factor is not the resolution but the image quality. Satellite photos have to go through more air which can cause the loss of some information and lower-contrast imagery. On the other hand, a lot of aerial imagery out there is film-based which does not generally have colour and contrast as good as digital aerial imagery. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
Mike N nice...@att.net wrote: I spotted this today as I was entering survey information: http://greenvilleopenmap.info/Airplane.jpg I didn't realize that the Bing planes flew so high. It looks like the plane in the photograph is in the process of taking off or landing, and thus is considerably closer to the ground than usual. -- John F. Eldredge -- j...@jfeldredge.com Reserve your right to think, for even to think wrongly is better than not to think at all. -- Hypatia of Alexandria ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] OT - Unusual Bing imagery
I spotted this today as I was entering survey information: http://greenvilleopenmap.info/Airplane.jpg I didn't realize that the Bing planes flew so high. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
On Wed, 18 Jul 2012 21:43:19 -0400 Mike N nice...@att.net wrote: I spotted this today as I was entering survey information: http://greenvilleopenmap.info/Airplane.jpg I didn't realize that the Bing planes flew so high. What is the correct tag for the plane? ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] OT - Unusual Bing imagery
On 2012-07-19 03:43, Mike N wrote: I spotted this today as I was entering survey information: http://greenvilleopenmap.info/Airplane.jpg I didn't realize that the Bing planes flew so high. I would guess that that plane is flying really low. Probably in approach to a landing. Maarten ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
